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If CONFIG_F2FS_CHECK_FS is not enabled, the lookup_extent_tree function will continue to run when the extent_tree is NULL, causing the kernel to crash. The dump like this: [05-13 09:41:14][ 3309.526262] Unable to handle kernel NULL pointer dereference at virtual a5ddress 0000000000000040 [05-13 09:41:14][ 3309.715348] Mem abort info: [05-13 09:41:14][ 3309.715618] ESR = 0x96000006 [05-13 09:41:14][ 3309.715899] Exception class = DABT (current EL), IL = 32 bits [05-13 09:41:14][ 3309.716416] SET = 0, FnV = 0 [05-13 09:41:14][ 3309.716693] EA = 0, S1PTW = 0 [05-13 09:41:14][ 3309.717003] Data abort info: [05-13 09:41:14][ 3309.717260] ISV = 0, ISS = 0x00000006 [05-13 09:41:14] 0): Mem abort info: [05-13 09:41:14]05-13 01:40:58.784 F/ ( 0): ESR = 0x96000006 [05-13 09:41:14]05-13 01:40:58.784 F/ ( 0): Exception class = DABT (current EL), IL = 32 bits [05-13 09:41:14]05-13 01:40:58.785 F/ ( 0): SET = 0, FnV = 0 [05-13 09:41:14]05-13 01:40:58.785 F/ ( 0): EA = 0, S1PTW = 0 [05-13 09:41:14]05-13 01:40:58.785 F/ ( 0): Data abort info: [05-13 09:41:14]05-13 01:40:58.785 F/ ( 0): ISV = 0, ISS = 0x00000006 [05-13 09:41:14]05-13 01:40:58.792 F/Internal error( 0): Oops: 96000006 [#1] PREEMPT SMP [05-13 09:41:14][ 3309.726031] Process Binder:382_1 (pid: 396, stack limit = 0x00000000b36c00c5) [05-13 09:41:14][ 3309.726670] CPU: 3 PID: 396 Comm: Binder:382_1 Tainted: G W 4.19.172 #166 [05-13 09:41:14][ 3309.727380] Hardware name: Rockchip RK3566 RK817 TABLET LP4X Board (DT) [05-13 09:41:14][ 3309.727968] pstate: 60400009 (nZCv daif +PAN -UAO) [05-13 09:41:14][ 3309.728412] pc : _raw_read_lock+0x20/0x48 [05-13 09:41:14][ 3309.728779] lr : f2fs_lookup_extent_tree+0xd0/0x330 [05-13 09:41:14][ 3309.729216] sp : ffffff800cc3b700 [05-13 09:41:14][ 3309.818050] Call trace: [05-13 09:41:14][ 3309.818288] _raw_read_lock+0x20/0x48 [05-13 09:41:14][ 3309.818617] f2fs_lookup_extent_tree+0xd0/0x330 [05-13 09:41:14][ 3309.819021] f2fs_lookup_extent_cache+0x4c/0x60 [05-13 09:41:14][ 3309.819427] f2fs_map_blocks+0x84/0x9e8 [05-13 09:41:14][ 3309.819774] f2fs_mpage_readpages+0x1e8/0x604 [05-13 09:41:14][ 3309.820166] f2fs_read_data_pages+0xf4/0x11c [05-13 09:41:14][ 3309.820551] read_pages+0x64/0x148 [05-13 09:41:14][ 3309.820852] __do_page_cache_readahead+0x164/0x1c4 [05-13 09:41:14][ 3309.821278] ondemand_readahead+0x1e4/0x264 [05-13 09:41:14][ 3309.821647] page_cache_async_readahead+0xb4/0xd0 [05-13 09:41:14][ 3309.822066] generic_file_read_iter+0x168/0x8b4 [05-13 09:41:14][ 3309.822474] f2fs_file_read_iter+0x34/0xa0 [05-13 09:41:14][ 3309.822848] generic_file_splice_read+0xc8/0x144 [05-13 09:41:14][ 3309.823263] splice_direct_to_actor+0xf8/0x274 [05-13 09:41:14][ 3309.823655] do_splice_direct+0x78/0xc8 [05-13 09:41:14][ 3309.824008] do_sendfile+0x1cc/0x404 [05-13 09:41:14][ 3309.824336] __se_compat_sys_sendfile+0x9c/0x26c [05-13 09:41:14][ 3309.824750] __arm64_compat_sys_sendfile+0x18/0x20 [05-13 09:41:14][ 3309.825181] el0_svc_common+0x98/0x160 [05-13 09:41:14][ 3309.825518] el0_svc_compat_handler+0x18/0x20 [05-13 09:41:14][ 3309.825913] el0_svc_compat+0x8/0x34 [05-13 09:41:14][ 3309.826244] Code: aa0003e1 52804000 11000529 b9001909 (b8a0003e) Signed-off-by: Cliff Chen <cliff.chen@rock-chips.com> Change-Id: Ic7d144eb2518ecc255428eff1c493dbcb36d7976
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.